Constant Mesh Gearbox Construction and Working
Constant mesh gearbox diagram is shown in the below figure.
|The general layout of Constant Mesh Gearbox|
The dog clutch can slide on the shaft and rotate with it. While all the gears on the countershaft are rigidly fixed with it.
As and when the left-hand dog clutch is made to slide to the left by means of the gear shift lever, it meshes with the clutch gear and the top speed gear is obtained. When the left-hand dog clutch meshes with the second gear, the second gear is obtained.
In this type of gearbox, all the gears are in constant mesh and hence for this reason, they are safe from being damaged and irritating grinding sound does not occur while engaging and disengaging.